Not at all. Laws has to be compatible with universal laws, international treaties/laws such as UN Geneva Convention and for Italy also the EU laws. Along many other conditions such as arbitrariness.
No they don't. What authority enforces that?
If not other country or international body has the willingness and capability to go to war with Italy in order to enforce its opinions, and if no country is willing to shun Italy over this or Italy is fine with the shunning, then Italy can have whatever laws it likes.
Yeah, because you're trying to convince me that 2+2=5.
> If you have read recent European Human Rights Court decisions, you can clearly see what kind of domestic laws is in violation of law. (Yes, I mean some domestic laws are in violation of laws)
And what's that court going to do to make Italy comply?
For instance: I can claim until I'm blue in the face that everyone has to comply with some "universal law" that I declare, and I can issue statements to that effect, but in reality that's totally meaningless because I lack the power to make others follow me. There are a lot of international bodies that makes similar claims, and similarly lack the power. Maybe those bodies persuaded you, but that doesn't matter to the unpersuaded.
International relations is literally anarchy. Sometimes there's cooperation that looks like law, and rhetoric that that claims the moral force of law, but the reality is anarchy -- which is why Putin was able to invade Ukraine and North Korea's government has remained in place for 70 years, doing things liberals find to be horrific and "illegal" the whole time.